Not sure about your methodology here, which seems to go something like.
"The best way and closest to a "result" for the question "How many Committed Christians are there is to see who turns up to church regularly So that must be what a Committed Christian is.
Ignore devotion and unique belief in Christ. That does not compute.
You are missing the point Vlad.
My comment wasn't on how you might determine who is and who is not a committed Christian (although I think those attending church would be 'committed' even if there may be some non attendees who are also 'committed').
No - my point was about how you might make those people identifiable to the public (in the way you seem to want for committed atheists) and whether you thought that was acceptable.
So simply question - do you think it would be acceptable to label 'committed christians' so they can be identified when out in public (whether those people want to have an identifier attached or not)? If not, why would this be appropriate for atheists.